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Property and Equipment, Net - Schedule of Property and Equipment, Net (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Sep. 30, 2023
Property Plant And Equipment [Line Items]    
Property and equipment $ 928.6 $ 857.4
Less: Accumulated depreciation 573.0 542.2
Property and equipment, net 355.6 315.2
Land    
Property Plant And Equipment [Line Items]    
Property and equipment 42.9 44.7
Building and Leasehold Improvements    
Property Plant And Equipment [Line Items]    
Property and equipment 45.9 45.6
Operating Equipment    
Property Plant And Equipment [Line Items]    
Property and equipment 384.1 338.8
Transportation Vehicles    
Property Plant And Equipment [Line Items]    
Property and equipment 377.3 351.9
Office Equipment and Software    
Property Plant And Equipment [Line Items]    
Property and equipment 74.0 68.7
Construction in Progress    
Property Plant And Equipment [Line Items]    
Property and equipment $ 4.4 $ 7.7
Minimum | Building and Leasehold Improvements    
Property Plant And Equipment [Line Items]    
Property and equipment, Useful Life 2 years  
Minimum | Operating Equipment    
Property Plant And Equipment [Line Items]    
Property and equipment, Useful Life 2 years  
Minimum | Transportation Vehicles    
Property Plant And Equipment [Line Items]    
Property and equipment, Useful Life 3 years  
Minimum | Office Equipment and Software    
Property Plant And Equipment [Line Items]    
Property and equipment, Useful Life 3 years  
Maximum | Building and Leasehold Improvements    
Property Plant And Equipment [Line Items]    
Property and equipment, Useful Life 40 years  
Maximum | Operating Equipment    
Property Plant And Equipment [Line Items]    
Property and equipment, Useful Life 7 years  
Maximum | Transportation Vehicles    
Property Plant And Equipment [Line Items]    
Property and equipment, Useful Life 7 years  
Maximum | Office Equipment and Software    
Property Plant And Equipment [Line Items]    
Property and equipment, Useful Life 10 years